Hydraulic press



Y sept, 1s, 19,23,

v F. E. STEVENSON HYDRAULIC PRESS Original Filed March 1o. 1922 2 Sheets-Sheen'l l Sept. 1s, w23.

11,468,523 F. E. s 'rEvENsoN HYDRAULIC PRESS Original Filed March l0. 1922 2 Sheets-Sheet 2 Patented Sept. 18, 1923..

NETE@ STATES 1,466,523? FATENT @FFHCBO FRANCIS E. STEVENSON, OF MOUNT GILEAD, OHIO, ASSIGNOR 'IO THE HYDRAULIC PRESS MANUFACTURING COMPANY, OF MOUNT GILEAD, OHIO.

HYDRAULIC PRESS.

To all whom it may concern-f Be it known that I, F RANcIs E. S'rnvENsoN, a citizen of the United States, and resident of Mount Gilead, in the county of Morrow and State of Ohio, have inventedcertain new and useful Improvements in Hydraulic Presses, of which the following is a specitcation.

My invention relates to operating means for hydraulic presses, particularly f or tile presses such as described in my application Serial No. 542,623, tiled March 10, 1922, of

which this application is a division.

An object of my invention is the provision of a valve operating mechanism for a hydraulic press, particularly one adapted for the use of low and high pressure.

Another object of the invention is to provide in a press wherein'certain instrumentalities are operated mechanically and other instrumentalities areoperated by4 hydraulic pressure, means whereby the power means may be cut off and the hydraulic means simultaneously cut `olf from the source or sources of pressure.

Other objects will be apparent from the following detailed description and the appended claims.

In the drawings:

Figure 1 is a vertical section through the press Vshowing the various parts thereof.

Figure 2is a fragmentary view, partly in section, of the mechanism for disconnectoperating means shaft 1 is mounted in .standards rising from the base 3 of the press, one of said standards being shown at 2.

Said shaft has a pinion 4 keyed or otherwise fastened thereto which meshes with a pinion 5 -connected to a pinion 5 and the pulley .6 rotating freely on a shaft 7 mounted in the standards. Power b is transmitted to the pulley 6 from any'suit able source by a belt 8 which is connected by 20, thus causing ,general relation of the view through a a pulley 6, both the- 542,623. Divided and this application iled .Tune 22,

No. 570,110. i

a. link 9 to a belt shift lever 10 by means of which the belt may be moved in the usual manner to throw it from the pulley 6 to an idler pulley 11 -whenever it is desired to stop the operation of the press.

Communicating with a valve box 12 is a pipe 13 connected to a source of high pressure and a pipe 14 connected to a source of low pressure. Pipes 15 and 16 lead from the valve box to operating valves hereinafter described. The passage in the valve box 12 which affords communication between the pipes 13 and 15 is controlled by a valve 17 having a stem 18, while the passage which affords communication between the pipes 14 and 16 is controlled by a valve 19 having a stem 20. These stems rest on or are fastened to a wedge member 21 underlying which is a cooperating wedge member 22 connected by a link 23 to the belt shifting lever 10.

In the position shown in Figure 2 the belt 8 is on the driving pulley 6 and the valves 17 and 19 are open.

the press, the lever-10 is operated throwing the belt 8 on tothe idler pulley 11 and at the same time sliding the wedge 22 outso that the wedge 21 can crop, together with the valve stems 18 and close their passages and cut off hydraulic pressure from the press. All parts of the press may be simultaneously stopped in this mannen IVhen desired to sta tf the press a reverse movement of they lever 10 will again cause power to be transmitted to the driving shaft 1 and open the valves 17 and 19.

A portion of the base 24. of the press proper is shown in Figures 1 and 2 and this is connected by strain. rods 25 to the cylinder 26 in which slides a press ram 27 connected to a platen 28 to the lower side of which is connected a sub-platen 29. Rigidly connected to the sub-platen is the upper die 30 which cooperates with a lower die 31 rigidly connected to the base 24. Fitting around the lower die is a mold plate 32.

This mold plate is connected by rods 33 to a crossV bar 34 which is moved downwardly by arms 35 of bell crank levers loosely turning 'on the shaft 7, the other arms- 36 extending downwardly and having rollers operated y cams l37 mounted 0n the shaft 1. The mold plate is returned by springs not herein shown.

the valves 17 and 19 to ated, while the to and fro movement of the A vvhoppegr-38 is supported above a charging box 39 which slides on a table 40. This table 40 has an up and down movement with the mold 32 and is counterbalanced by tail lierein,"since it is fully sprin s 41 bearing against brackets 42 connected to the base-24. The charging box 39 is given a reciprocating motion -by means of a lever 44 connected therewith by pin and slot connections 43. This lever is connected tothe brackets 42 by links 45 and 46, forining a floating support for s aid lever. At its llower end the lever 44 is cnnected to a piston 47 of hydraulic mechanism generally vindicated at 48. Hydraulic pressure is communicated to the cylinder 26 through a pipe 49 as shown inFigure 1, this pipe communieating with the valve box indicated'in Figure 4.

The structure and operation of the press proper is n'ot illustrated nor described in deshown in the parent application andforms no part of the invention claimed in this case. It is merely desired to show thatthe up andidown movement of the mold plate is mechanically opercharging boX and the movement of the ram 27 are controlled by hydraulic pressure.-

Suitably located in the base of the machine is a valve box 50, indicated in. outline in F igure' 4, with which communicate the pipes 15, 16, 49 and a pipe 51 leading back to the source of pressure and acting as a return or exhaust pipe. In this b'oX are disposed 4valves A4, B4, C, D4, and E4 controlled to admit pressure to the ram 27 from high or low pressure sources as desired and as explained in detail in the parent application.

These valves are controlled as follows. Upon the shaft 1 is mounted a wheel 52 having cam grooves 53 and 54 in opposite faces. In Figure 4 this wheel is shown as split into two parts. for clearness, while in Figure 3 one cam groove 53 is shownin full lines and the one on the opposite face of the Wheel 52 is'shown in dotted lines. Each cam groove controls a pair of valves, and as the'o'perating means is identical for each pair, it will be described for one pair only and with reference particularly to Figure 3.

In the groove 53 operates a roller 55 'on the end of a sliding arm 56 supported 'in'memy,bers 57; -A p`n 58 on this slide engages in an elongated slot 59 in the vertical arm of a -T-shaped lever 60 pivoted at 61 and having arms 62 and 63 carrying screws 64 and 65 respectively which may oe adjusted and held as desired by lock nuts as clearly shown in the drawings.

These p1ns`64 and 65 underlie identical valve stems 66 surrounded by springs 67 y which lie between the heads of the stems and the valve glands 68. Suitable flange packing 69 is provided and the valves 7 O are check valves 'of a common and well known type.

It is obvious that rotation of the wheel 52 I tion is to be regarded as limited only by the scope of the appended claims.

I claim as my invention:

l'. A press compr1s1ng a mold, la charging device, power means .for operating the mold and charging device, a platen, hydraulic means for operating the platen, and means for simultaneously disconnecting the power means and cutting olf the hydraulic means fromthe source of pressure regardless of lthe position of theoperating parts of the press.

2. A press comprising power means for operating elements thereof, hydraulic means for operating other elements, said hydraulic means receiving power from sources of high and low pressure, and means for simultaneously disconnecting the power means and cutting-olf the hydraulic means from both sources of pressure regardless of the position i of the operating parts of the press.

3. A press comprising power means for A operating elements thereof, hydraulic means for operating other elements, said hydraulic means receiving power from sources of high and low pressure, a valve' box, valves'therein controlling the supply of power from both Asources to. the hydraulic means, and means for simultaneously disconnecting thepower means, and closing said valves. n

,4. In a press, a valve mechanism comprising two check valves, separate stems underlying each valve, a three armed lever, an arm of the lever underlying, each stem, a sliding arm connected to the third lever arm, and ca'm means for sliding this arm, thereby rocking the lever and operating the valves as desired.,

5. In a press, a valve mechanism comprisingtwo check valves, separate stems disconnected therefrom but underlying the same, springs for normally urging the stems downward, a three armed lever having an arm underlying. each stem, a sliding arm connected to the third lever arm, and cam means for slidin this arm, thereby rocking the leveran operating the valves as desired.

6. In a press, a valve mechanism comprising twocheck valves,I separate stems disconnected there om but underlying the same,

springs for normally urging said stems downward, a three armed lever having an arm underlying each stem, a sliding arm connected to the third lever arm, a power shaft, and cam means vrotating with the power shaft to operate the sliding arm, thereby rocking the lever and operating the valves as desired. I

7. In a press, a valve mechanism comprising a plurality of valves, stems disconnected therefrom but adjacent the same, a threearmed lever of which two arms lie, adjacent the valve stems, a sliding means engaging the third armA of the lever to operate the same, and cam means for controlling the sliding movement of said means.

8. In a press, a valve mechanism comprising a plurality of valves, stems disconnected therefrom but adjacent the same, a threearmed lever of which two arms lie adjacent the `valve stems, a .sliding member having a pin and slotconnection with the third arm Ving a plurality of valves,

of the lever, and cam means for operating said sliding member.

9. In a press, a valve mechanism comprisstems disconnected therefrom butJ adjacent the same, a threearmed lever of which two arms lie adjacent the valve stems, adjustable means in said arms to engage the stems, and cam-operated means for moving the levers to operate the valves in the desired sequence.'

10. In a pressfa valve mechanism comprising a plurality of valves, stems disconnected therefrom but adjacent the same, springs for holding the stems in inoperative position, levers having arms arranged to operate said stems, and cam-operated means for moving said levers as desired to operate the valves in the desired sequence.`

In testimony whereof, I have hereunto subscribed my name.

FRANCIS E. sTEvENsoN. 

